KJVonly people just use KJV as their only source, thats the thing.
When they reference, they reference ONLY the KJV. They dont need to reference any other Bible or book. They just get all their scripture from KJV.
No need to get into a huff about it.
In some ways, it makes it easier instead of referencing 20 other versions.
Academics like to study other books, and read widely, and produced pages of bibliography and cross referencing, but this is the thing academics fail to underrstand. Some people dont have time to study 20 different versions, They dont want to do comparative literature studies.
They just want to trust ONE Bible to tell them Gods Word. To know one deeply than a hundred others skimming the surface. If happens to be KJV then thats fine...its all good...its the Bible. I would only be concerned if someone told me they get all their scripture from the Book of Mormon and that was the only book they ever read.